Heavy Duty Velcro...... You'd be amazed at how strong and durable that stuff can be! Especially the kind that is plastic on BOTH parts, rather than plastic and cloth.
The important thing is to prepare the surfaces with degreaser of some kind before you apply the Velcro, and then give it a day to adhere properly before you add and remove the other piece. I had stuff that was supporting quite a bit of weight, and taken apart every day, and the velcro lasted several years!
For those of you that hate keyboard 'bounce, especially the super light 'portables', heavy duty velcro the keyboard to the stand, and all becomes one. Much more stable...!
A million and one uses..... now a million and two!
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An arranger is just a tool. What matters is what you build with it..!